Design Scheme for Food Processing Wastewater Treatment Equipment

Design Scheme for Food Processing Wastewater Treatment Equipment——Main process flow

Domestic sewage is collected by the sewage pipeline network and enters the regulating tank through a grid. The grid intercepts suspended and floating solids in the sewage. The sewage in the regulating tank is lifted by a lift pump to an integrated sewage treatment device, which integrates anoxic tank, aerobic biological contact oxidation, sedimentation tank, and sterilization and disinfection.(The specific process depends on the actual situation, and the composition of the structure may vary. Here, only the typical process flow will be described)

(1)Grille treatment

This process sets up one coarse and one fine grid to remove soft fibers and large particle impurities from the sewage, to prevent blockages in the water pump, valves, and pipelines, and to ensure the normal operation of the treatment equipment. Set up at the inlet of the regulating pool1Fixed grille with a gap of5mmThe main purpose is to intercept large solid particles and plastic bags to prevent them from entering the regulating tank, in order to reduce the load of organic matter and prevent blockage of the sewage pump. The material of the fixed grille frame isSS304stainless steel. The coarse and fine grilles are manually operated to remove slag, usually once a week. The sewage is treated with coarse and fine grids and then connected to the regulating tank.

(2)equalization tank

After passing through the grid, the sewage enters the regulating aeration tank. Due to different times, the water quantity and quality are uneven at different times. To ensure the continuous operation of subsequent equipment, a comprehensive regulating tank is designed to store the sewage and ensure uniform water quality. Due to its large capacity, the sewage flow rate in this regulating tank is slow, and the fine particles originally suspended in the water are prone to settle at the bottom of the tank, causing the regulating tank to become clogged and the sludge to ferment, emitting foul odors and affecting the surrounding environment. To prevent such phenomena from occurring, aeration measures are installed in the tank, which mainly serve the following main functions:AAvoid sedimentation of suspended solids in sewage;BOxygenation of wastewater to preventH2SWaiting for the generation and accumulation of toxic gases. Set up an emergency discharge outlet for the regulating pool and a sewage lifting pump2Taiwan(One in use, one backup, automatic switching)Sewage pump level controller2Basic supporting facilities such as sets, maintenance ladders, etc. The sewage pump of the regulating pool lifts the sewage into the sewage biochemical treatment system, which has oxygen deficiency(anaerobic)Composed of tanks, contact oxidation tanks, sedimentation tanks, disinfection tanks, sludge tanks, etc.

(3)anoxic tank(anaerobic tank)

The main purpose of this pool is twofold:

AMixing of inflow and reflux sludge water for anaerobic denitrification reaction. Under the action of anaerobic microorganisms, sewage decomposes organic nitrogen into ammonia nitrogen. At the same time, organic carbon sources are used as electron donors to convert nitrite nitrogen and nitrate nitrogen into nitrogen gas, and some organic matter and ammonia nitrogen are used to synthesize new cellular substances.

(4)contact oxidation tank

This process adopts the biological contact oxidation method as the main process for removing organic matter. The biofilm method for treating domestic sewage has the following characteristics compared to traditional processes:AThe organic load is high, and the energy required to remove organic matter per unit volume is higher in biochemical methods. Its volumetric load is up to2-3KgBOD/m3.d,It is a conventional activated sludge process5Double, yesSBRThe method of oxidation ditch3As a result, the footprint is smaller than in biochemical methods.BThere is no sludge expansion, and since sludge reflux is not implemented, there is no risk of excessive growth of sludge causing oxygen deficiency and deterioration of effluent quality in the reaction tank.COn fillers with good impact resistance and contact with oxidizing bacteria, when subjected to high load impact, only the biofilm on the surface of the filler is generally damaged, and the internal biological bacteria can quickly recover.DConvenient management, due to the above advantages, enables simple unmanned control of the contact oxidation method without affecting water quality, reducing the number of operators and appropriately lowering operating costs.EEnergy saving, contact oxidation method is equipped with fillers inside, which generally have a secondary cutting effect on the air. Therefore, the utilization rate of oxygen in the air is greatly improved, which can effectively reduce power consumption.

(5)secondary sedimentation tank

Secondary sedimentation is set up to remove microbial corpses that have fallen off from water after oxidation. It adopts a vertical flow inclined tube sedimentation tank and is designed with a surface load of:1.0m3/m2.hRising flow velocity0.28mm/SThe upper part of the sedimentation tank is the catchment area, the middle part is the sedimentation zone, and the lower part is the sludge hopper. The residence time of the secondary sedimentation tank is2At the outlet of the secondary sedimentation tank, a tooth shaped water collection tank with adjustable liquid level is installed to fully ensure the sedimentation effect of the sedimentation tank. The inclination angle of the sludge hopper is55The sedimented sludge is periodically discharged into the sludge tank by an air lift device. After the sedimentation tank, sand filters can be added as needed.

(6)disinfection pool

The effluent from the secondary sedimentation tank enters the disinfection tank. The disinfection time of this equipment follows the specifications“GBJ48-83”The standard is30In minutes, a disinfection method using solid chlorine tablets for contact dissolution and folded plate mixing reaction is adopted. The disinfection device can change the dosage according to the amount of treated water, achieving the goal of adding more water and more chemicals, and adding less water and less chemicals. After disinfection, the treated water can meet the discharge requirements.

(7)sludge tank

The sludge from the secondary sedimentation tank enters the aerobic sludge digestion tank, which is equipped with an aerobic sludge digestion system. The vast majority of organic sludge can be digested, and the supernatant of the sludge flows back to the regulating tank. The remaining sludge is small and is regularly pumped out by the environmental sanitation department commissioned by the owner.

Design Scheme for Food Processing Wastewater Treatment Equipment——Process Characteristics

1Using unique and efficient suspension carriers and advancedMBRProcess, carrier containing30%Powder activated carbon with a specific surface area of up to20000m2/m3The biomass can reach up to30-40g/lGreatly increase the capacity load of the aerobic tank to achieve the same level as conventional activated sludge or contact oxidation processes2-3By doubling, the volume of integrated equipment can be reduced by one-third to one-half, and the equipment can occupy a large area and save costs, resulting in a corresponding decrease in investment.

2TheMBRThe process can directly achieve synchronous nitrification denitrification and short-range nitrification denitrification in aerobic tanks without the need for anoxic tanks,A/OThe method can achieve efficient biological sputum and phosphorus removal while saving carbon sources.

3The fluidized carrier containing activated carbon can cut and adsorb bubbles, improve the oxygen conversion efficiency of the system, save energy, and reduce operating costs; Unique carrier technology enables the system's sludge production to be comparable to that of ordinary activated sludge30%The equipment discharges less sludge, usually every six months, making sewage system management simpler.

4Adopting containerized structure, integrated design, no need for civil engineering, short construction period, low investment, and fast production; It has the advantages of compactness, small footprint, flexible operation, and easy mobility.

5The power equipment is placed inside the container, with low noise and minimal impact on the surrounding environment, achieving efficient sewage treatment while ensuring coordination with the surrounding environment.

6Using immobilized photocatalytic sterilization andAFFAsymmetric fiber filtration system can achieve deep denitrification, phosphorus removal, and disinfection treatment, and the effluent can be one level largerAStandard.

Design Scheme for Food Processing Wastewater Treatment Equipment——Economic Benefit Analysis

The adoption of integrated sewage treatment equipment technology has considerable economic benefits, mainly manifested in:

1Save raw materials: The assembly is formed by welding steel plates together and connecting them with bolts. Using computer-aided design to make the overall design reasonable.

2Improve the service life of equipment: After special processing, fiberglass coating (or other anti-corrosion forms) is applied to both the inner and outer surfaces of the standard board. The protective layer formed by the pre-treatment board not only prevents corrosion of the cylinder, but also has the function of resisting strong acids and alkalis. The lifespan is20Years or more.

3Low investment: Due to low material usage, simple installation of prefabricated structures, and low personnel requirements. These make investment low. Its quality is much higher than that of ordinary welded steel structure reactors, and its anti-corrosion performance and service life can reach or exceed those of reactors made of stainless steel materials, at a price only of1/2Assembled reactors can save costs per cubic meter compared to using concrete10%The above.